Sample Size Calculator

When conducting research, surveys, polls, or product testing, it’s critical to ensure your sample size is large enough to produce accurate, reliable insights. The Sample Size Calculator on NGDrives helps you determine how many responses you need to achieve statistical confidence without surveying your entire population.

Whether you're a business owner conducting customer feedback, a student designing a research project, or a public health analyst running a field study, choosing the right sample size ensures your results are representative, not misleading. Too small a sample could lead to false conclusions, while too large may waste time and resources.

This calculator uses your total population size, desired confidence level, and margin of error to determine the smallest number of responses needed for trustworthy data. This is especially important in:

• Market research before launching a product or service
• Academic research projects needing ethical sampling
• NGO field surveys assessing public health or outreach
• Online polls or form feedback with limited time or budget

For example, if your population is 10,000 people and you want a 95% confidence level with a ±5% margin of error, the calculator might tell you that you need to survey approximately 370 individuals. This gives you enough accuracy without overspending on data collection.

Form Inputs:

• Population Size – Total number of people in your population (e.g., customers, students, residents).
• Confidence Level (%) – How confident you want to be that your sample reflects the true population (commonly 90%, 95%, or 99%).
• Margin of Error (%) – How much error you’re willing to tolerate in your results (typically 5% or lower).

 What’s Calculated:

• Minimum Required Sample Size – The number of people you should include in your sample for accurate results.

Output:

• A single number: the recommended sample size based on your inputs.
• Optimized for reliability and efficiency.

If you encounter any issues or have suggestions for improvements, please report them using the form below.